The present invention relates to the use of
cannabidivarin (CBDV) for the treatment of seizures associated with rare
epilepsy syndromes. In particular, the seizures associated with rare
epilepsy syndromes to be treated are those experienced by patients diagnosed with
Rett syndrome. In a further embodiment, the types of seizures include focal motor seizures with
functional impairment, focal non-motor seizures with
functional impairment, generalized motor seizures, generalized non-motor seizures, motor seizures of unknown onset, and non-motor seizures. Preferably, the
dose of CBDV is between 2.5 mg / kg / day and 10 mg / kg / day.